Removing A Fan Controller - Nortel Passport 15000 Hardware Installation And Maintenance

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686 Chapter 17 Hardware procedures

Removing a fan controller

Prerequisites

Procedure steps

241-1501-240 5.2S2

Remove a fan controller if it fails and replace it immediately prior to re-

inserting the fan.

You must be familiar with "Safety considerations and best practices"

Each controller is mounted on a carriage plate inside the cooling unit and

behind the fan it controls. Before removing a fan controller, you must do

the procedure "Removing a fan" (page 682).

For controller NTHR10AA in a lower cooling unit NTHR51AA or an

upper cooling unit NTHR52AA, you need a one-piece short-shafted

large-bladed slotted screwdriver to unfasten the captive screw.

For controller NTHR10AB in a lower cooling unit NTHR51AB or an

upper cooling unit NTHR52AB, you need a one-piece large Phillips

screwdriver to unfasten the captive screw.

You may need a bright ﬂashlight to see through the spinning fan blades

at what your hand is touching inside the cooling unit.

With the fan removed, look inside the cooling unit to ﬁnd where the wires

are connected to the controller and where the large captive screw is. The

number of connectors vary between the AA and AB versions of the

controller, as shown in these ﬁgures:

"Location of the fan controllers inside an NTHR51AA or NTHR52AA

cooling unit" (page 688)

"Location of the fan controllers inside a cooling unit NTHR52AB"

"Location of the fan controllers inside a cooling unit NTHR51AB"

"Fan controller connections on an NTHR10AB" (page 691)

Reaching inside the cooling unit through the opening where the fan was,

unplug the cable connectors from the controller. While pressing tabs

inwards on the sides of each connector, pull upwards perpendicularly to

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